Fish heating tolerance scales similarly across individual physiology and populations

Abstract Extrapolating patterns from individuals to populations informs climate vulnerability models, yet biological responses warming are uncertain at both levels. Here we contrast data on the heating tolerances of fishes laboratory experiments with abundance wild populations. We find that in terms individual physiologies lab and decline increasing temperature same rate. However, a given acclimation or optimum temperature, tropical have broader than temperate ones. These congruent relationships implicate tight coupling between physiological demographic processes underpinning macroecological patterns, identify species.